Self-assembled Ti₃C₂T_x/SCNT composite electrode with improved electrochemical performance for supercapacitor

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Two-dimensional (2D) titanium carbide (Ti3C2Tx) is a promising supercapacitor electrode material due to its excellent properties.
• Irreversible restacking of Ti3C2Tx sheets during synthesis hinders its practical application and limits performance.

Purpose of the Study:

• To design and synthesize Ti3C2Tx/SCNT self-assembled composite electrodes.
• To mitigate the restacking issue of Ti3C2Tx sheets using single-walled carbon nanotubes (SCNTs) as interlayer spacers.
• To enhance the electrochemical performance and stability of supercapacitor electrodes.

Main Methods:

• Rational design and synthesis of Ti3C2Tx/SCNT self-assembled composite electrodes.
• Utilizing SCNTs as interlayer spacers to prevent Ti3C2Tx sheet restacking.
• Characterization of electrode properties and electrochemical performance evaluation.

Main Results:

• The Ti3C2Tx/SCNT composite effectively reduced Ti3C2Tx sheet restacking.
• SCNTs increased the specific surface area and interlayer spacing, improving electrolyte ion accessibility.
• The composite electrode achieved a high areal capacitance of 220 mF/cm² (314 F/cm³) and 95% capacitance retention after 10,000 cycles.

Conclusions:

• The developed Ti3C2Tx/SCNT composite electrodes offer superior electrochemical performance for supercapacitors.
• SCNTs are effective in preventing restacking and enhancing the energy storage capabilities of 2D titanium carbide.
• This strategy presents a viable approach for advancing 2D material-based energy storage devices.